Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Anterix Inc.

CIK 0001304492ATEX· quarter ending 2026-06-30

Shares outstanding

19,609,786

as of 2026-08-06 · 10-Q cover page, filed 2026-08-11

Held by 13F filers

19,108,265

97.4% of shares outstanding

Holders

171

+39 vs 2026-03-31 · 58 new, 19 exited

Value

$2.0B

shares +12.8% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-11, as of 2026-08-06)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	ATEX · NASDAQ	19,609,786	19,108,265	97.4%	171	03676C100

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	03676C100	COM	171	19,108,265	19,609,786	97.4%	$2.0B	9 call / 8 put	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (171 of 171 · 03676C100)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	Owl Creek Asset Management, L.P.	5,411,776	27.60%	$557.1M	—
2	T. Rowe Price Investment Management, Inc.	2,348,019	11.97%	$241.7M	NEW
3	Heard Capital LLC	1,716,738	8.75%	$176.7M	—
4	BlackRock, Inc.	1,075,115	5.48%	$110.7M	+67,972 (+6.7%)
5	PRICE T ROWE ASSOCIATES INC /MD/	750,451	3.83%	$77.3M	+742,496 (+9333.7%)
6	Jupiter Topco LLC	662,415	3.38%	$68.2M	NEW
7	VANGUARD CAPITAL MANAGEMENT LLC	553,002	2.82%	$56.9M	-20,845 (-3.6%)
8	PLUSTICK MANAGEMENT LLC	520,000	2.65%	$53.5M	+20,404 (+4.1%)
9	STATE STREET CORP	495,950	2.53%	$51.1M	+108,032 (+27.8%)
10	GAMCO INVESTORS, INC. ET AL	415,520	2.12%	$42.8M	-10,300 (-2.4%)
11	GEODE CAPITAL MANAGEMENT, LLC	388,076	1.98%	$40.0M	+13,775 (+3.7%)
12	QVT Financial LP	383,941	1.96%	$39.5M	-120,000 (-23.8%)
13	DIMENSIONAL FUND ADVISORS LP	370,964	1.89%	$38.2M	-53,892 (-12.7%)
14	FMR LLC	370,400	1.89%	$38.1M	+235,105 (+173.8%)
15	GABELLI FUNDS LLC	278,500	1.42%	$28.7M	+12,700 (+4.8%)
16	Invesco Ltd.	200,975	1.02%	$20.7M	NEW
17	VANGUARD PORTFOLIO MANAGEMENT LLC	158,469	0.81%	$16.3M	-6,073 (-3.7%)
18	GARNET EQUITY CAPITAL HOLDINGS, INC.	156,119	0.80%	$16.1M	-187,377 (-54.5%)
19	Potomac Capital Management, Inc.	155,071	0.79%	$16.0M	-18,731 (-10.8%)
20	Panoramic Capital, LLC	154,377	0.79%	$15.9M	+19,377 (+14.4%)
21	GOLDMAN SACHS GROUP INC	139,334	0.71%	$14.3M	-22,452 (-13.9%)
22	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	139,278	0.71%	$14.3M	-2,110 (-1.5%)
23	BANK OF AMERICA CORP /DE/	134,686	0.69%	$13.9M	-33,095 (-19.7%)
24	NORTHERN TRUST CORP	123,231	0.63%	$12.7M	+5,621 (+4.8%)
25	VANGUARD FIDUCIARY TRUST CO	120,999	0.62%	$12.5M	+1,543 (+1.3%)
26	KIRR MARBACH & CO LLC /IN/	116,069	0.59%	$11.9M	+2,255 (+2.0%)
27	D. E. Shaw & Co., Inc.	92,990	0.47%	$9.6M	+87,294 (+1532.5%)
28	MORGAN STANLEY	80,425	0.41%	$8.3M	-22,233 (-21.7%)
29	OpenArc Corporate Advisory, LLC	75,576	0.39%	$7.8M	+1,728 (+2.3%)
30	Beartown Capital Management, LLC	75,000	0.38%	$7.7M	-25,000 (-25.0%)
31	Granahan Investment Management, LLC	72,121	0.37%	$7.4M	NEW
32	Bank of New York Mellon Corp	69,374	0.35%	$7.1M	+1,538 (+2.3%)
33	Marble Bar Asset Management LLP	68,248	0.35%	$7.0M	+14,739 (+27.5%)
34	683 Capital Management, LLC	66,000	0.34%	$6.8M	+20,000 (+43.5%)
35	CITIGROUP INC	59,998	0.31%	$6.2M	-59,863 (-49.9%)
36	Trexquant Investment LP	53,423	0.27%	$5.5M	+13,248 (+33.0%)
37	TD Asset Management Inc	53,258	0.27%	$5.5M	NEW
38	Informed Momentum Co LLC	52,534	0.27%	$5.4M	NEW
39	Potrero Capital Research LLC	46,525	0.24%	$4.8M	-183,036 (-79.7%)
40	Teton Advisors, LLC	43,000	0.22%	$4.4M	-10,000 (-18.9%)
41	Nuveen, LLC	35,798	0.18%	$3.7M	+12,923 (+56.5%)
42	Creative Planning	34,541	0.18%	$3.6M	+2,577 (+8.1%)
43	GILDER GAGNON HOWE & CO LLC	32,833	0.17%	$3.4M	NEW
44	WELLINGTON MANAGEMENT GROUP LLP	31,006	0.16%	$3.2M	NEW
45	HRT FINANCIAL LP	30,673	0.16%	$3.2M	-144,252 (-82.5%)
46	MILLENNIUM MANAGEMENT LLC	30,340	0.15%	$3.1M	-277,582 (-90.1%)
47	EVR Research LP	25,000	0.13%	$2.6M	NEW
48	UBS Group AG	24,018	0.12%	$2.5M	-23,857 (-49.8%)
49	Campbell & CO Investment Adviser LLC	21,084	0.11%	$2.2M	-19,376 (-47.9%)
50	HARBOR CAPITAL ADVISORS, INC.	20,805	0.11%	$2.1M	NEW
51	HANSEATIC MANAGEMENT SERVICES INC	18,418	0.09%	$1.9M	NEW
52	Caption Management, LLC	17,532	0.09%	$1.8M	NEW
53	JANE STREET GROUP, LLC	17,506	0.09%	$1.8M	-403,351 (-95.8%)
54	Quantinno Capital Management LP	17,229	0.09%	$1.8M	+1,610 (+10.3%)
55	WOODMONT INVESTMENT COUNSEL LLC	16,973	0.09%	$1.7M	-1,334 (-7.3%)
56	JPMORGAN CHASE & CO	16,489	0.08%	$1.6M	+11,413 (+224.8%)
57	STATE OF WISCONSIN INVESTMENT BOARD	16,070	0.08%	$1.7M	+2,801 (+21.1%)
58	AMERICAN CENTURY COMPANIES INC	15,731	0.08%	$1.6M	+9,070 (+136.2%)
59	DEUTSCHE BANK AG\	15,643	0.08%	$1.6M	+6,199 (+65.6%)
60	TORONTO DOMINION BANK	15,600	0.08%	$1.6M	+6,500 (+71.4%)
61	WELLS FARGO & COMPANY/MN	14,648	0.07%	$1.5M	+8,745 (+148.1%)
62	RHUMBLINE ADVISERS	14,337	0.07%	$1.5M	+222 (+1.6%)
63	AQR CAPITAL MANAGEMENT LLC	13,437	0.07%	$1.4M	+2,337 (+21.1%)
64	CAXTON ASSOCIATES LLP	13,432	0.07%	$1.4M	NEW
65	GWN SECURITIES INC.	13,425	0.07%	$1.4M	-3,043 (-18.5%)
66	ALLIANCEBERNSTEIN L.P.	13,330	0.07%	$509K	+1,200 (+9.9%)
67	Quadrature Capital Ltd	12,979	0.07%	$1.3M	-1,523 (-10.5%)
68	Jefferson Bridge Capital, LLC	12,950	0.07%	$1.3M	—
69	LPL Financial LLC	12,353	0.06%	$1.3M	NEW
70	Vanguard Global Advisers, LLC	10,841	0.06%	$1.1M	+3,875 (+55.6%)
71	FCG Investment Co	10,762	0.05%	$1.1M	NEW
72	Waterfront Wealth Inc.	10,714	0.05%	$1.1M	-49,241 (-82.1%)
73	Numerai GP LLC	10,271	0.05%	$1.1M	NEW
74	STRS OHIO	9,800	0.05%	$1.0M	-5,900 (-37.6%)
75	CITADEL ADVISORS LLC	9,014	0.05%	$928K	-152,149 (-94.4%)
76	Gotham Asset Management, LLC	8,867	0.05%	$913K	NEW
77	XTX Topco Ltd	8,582	0.04%	$883K	NEW
78	Gem Investment Advisors, LLC	7,183	0.04%	$739K	—
79	CenterBook Partners LP	6,877	0.04%	$708K	-120,797 (-94.6%)
80	MetLife Investment Management, LLC	6,651	0.03%	$685K	+49 (+0.7%)
81	Covestor Ltd	6,637	0.03%	$683K	-1,870 (-22.0%)
82	Inspire Investing, LLC	6,604	0.03%	$680K	-6,705 (-50.4%)
83	OCCUDO QUANTITATIVE STRATEGIES LP	6,562	0.03%	$675K	NEW
84	PRUDENTIAL FINANCIAL INC	6,532	0.03%	$672K	+75 (+1.2%)
85	Aster Capital Management (DIFC) Ltd	6,100	0.03%	$628K	NEW
86	Central Pacific Bank - Trust Division	6,000	0.03%	$618K	—
87	SUSQUEHANNA INTERNATIONAL GROUP, LLP	5,584	0.03%	$575K	-34,214 (-86.0%)
88	FIRST TRUST ADVISORS LP	5,578	0.03%	$574K	NEW
89	SIMPLEX TRADING, LLC	5,377	0.03%	$554K	-38,373 (-87.7%)
90	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	5,290	0.03%	$545K	-135 (-2.5%)
91	Cornerstone Investment Partners, LLC	4,866	0.02%	$501K	NEW
92	DARK FOREST CAPITAL MANAGEMENT LP	4,720	0.02%	$486K	NEW
93	NEW YORK STATE COMMON RETIREMENT FUND	4,509	0.02%	$464K	+1,800 (+66.4%)
94	Baader Bank Aktiengesellschaft	4,500	0.02%	$463K	NEW
95	Aquatic Capital Management LLC	4,299	0.02%	$443K	NEW
96	Atom Investors LP	4,124	0.02%	$425K	-80,055 (-95.1%)
97	Brevan Howard Capital Management LP	4,028	0.02%	$415K	NEW
98	MIRABELLA FINANCIAL SERVICES LLP	4,025	0.02%	$414K	NEW
99	VIRTUS ADVISERS, LLC	3,976	0.02%	$409K	+476 (+13.6%)
100	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	3,975	0.02%	$409K	NEW
101	MARSHALL WACE, LLP	3,757	0.02%	$387K	NEW
102	TWO SIGMA INVESTMENTS, LP	3,716	0.02%	$383K	NEW
103	CANADA PENSION PLAN INVESTMENT BOARD	3,700	0.02%	$381K	NEW
104	AVIVA PLC	3,644	0.02%	$375K	NEW
105	Russell Investments Group, Ltd.	3,471	0.02%	$357K	+2,337 (+206.1%)
106	Balyasny Asset Management L.P.	3,254	0.02%	$335K	NEW
107	MANUFACTURERS LIFE INSURANCE COMPANY, THE	3,123	0.02%	$321K	NEW
108	Police & Firemen's Retirement System of New Jersey	3,069	0.02%	$316K	—
109	Proficio Capital Partners LLC	3,000	0.02%	$309K	-17,000 (-85.0%)
110	IMC-Chicago, LLC	2,929	0.01%	$302K	-27,434 (-90.4%)
111	SG Americas Securities, LLC	2,925	0.01%	$301K	NEW
112	Ballentine Partners, LLC	2,917	0.01%	$300K	NEW
113	MERCER GLOBAL ADVISORS INC /ADV	2,716	0.01%	$280K	NEW
114	Inscription Capital, LLC	2,544	0.01%	$262K	NEW
115	COMMONWEALTH EQUITY SERVICES, LLC	2,501	0.01%	$257K	NEW
116	BARCLAYS PLC	2,341	0.01%	$241K	+181 (+8.4%)
117	ROYAL BANK OF CANADA	2,335	0.01%	$240K	-699 (-23.0%)
118	VOYA INVESTMENT MANAGEMENT LLC	2,247	0.01%	$231K	NEW
119	INTECH INVESTMENT MANAGEMENT LLC	2,206	0.01%	$227K	NEW
120	IEQ CAPITAL, LLC	2,195	0.01%	$226K	NEW
121	FourThought Financial Partners, LLC	2,173	0.01%	$224K	NEW
122	Legal & General Group Plc	2,152	0.01%	$222K	-244 (-10.2%)
123	BNP PARIBAS FINANCIAL MARKETS	2,123	0.01%	$219K	-354 (-14.3%)
124	VICTORY CAPITAL MANAGEMENT INC	2,102	0.01%	$216K	NEW
125	Entropy Technologies, LP	2,025	0.01%	$208K	NEW
126	LMR Partners LLP	2,022	0.01%	$208K	NEW
127	FIFTH THIRD BANCORP	1,685	0.01%	$173K	—
128	Caitong International Asset Management Co., Ltd	1,137	0.01%	$117K	+569 (+100.2%)
129	Tower Research Capital LLC (TRC)	1,071	0.01%	$110K	+215 (+25.1%)
130	Ameritas Investment Partners, Inc.	1,033	0.01%	$106K	—
131	Parallel Advisors, LLC	933	0.00%	$96K	—
132	Pinnacle Wealth Planning Services, Inc.	612	0.00%	$63K	—
133	Redwood Family Wealth LLC	500	0.00%	$51K	NEW
134	Arax Advisory Partners	451	0.00%	$46K	NEW
135	SIGNATUREFD, LLC	449	0.00%	$46K	—
136	NISA INVESTMENT ADVISORS, LLC	435	0.00%	$45K	+232 (+114.3%)
137	Versant Capital Management, Inc	405	0.00%	$42K	—
138	IFP Advisors, Inc	397	0.00%	$41K	-681 (-63.2%)
139	FNY Investment Advisers, LLC	350	0.00%	$36K	-10,871 (-96.9%)
140	JONES FINANCIAL COMPANIES LLLP	296	0.00%	$27K	NEW
141	SBI Securities Co., Ltd.	270	0.00%	$28K	NEW
142	Allworth Financial LP	230	0.00%	$24K	-12 (-5.0%)
143	PNC Financial Services Group, Inc.	214	0.00%	$22K	+3 (+1.4%)
144	OSAIC HOLDINGS, INC.	192	0.00%	$20K	—
145	Private Wealth Management Group, LLC	185	0.00%	$19K	—
146	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	158	0.00%	$16K	-451 (-74.1%)
147	Quantbot Technologies LP	155	0.00%	$16K	-8,464 (-98.2%)
148	US BANCORP \DE\	149	0.00%	$15K	-75 (-33.5%)
149	Walleye Capital LLC	148	0.00%	$15K	NEW
150	Farther Finance Advisors, LLC	106	0.00%	$11K	-26 (-19.7%)
151	GAMMA Investing LLC	67	0.00%	$7K	—
152	SJS Investment Consulting Inc.	64	0.00%	$7K	NEW
153	FEDERATED HERMES, INC.	56	0.00%	$6K	+6 (+12.0%)
154	WPG Advisers, LLC	55	0.00%	$6K	—
155	Silver Grove Financial Group, Inc.	45	0.00%	$5K	NEW
156	MassMutual Private Wealth & Trust, FSB	44	0.00%	$5K	+7 (+18.9%)
157	Sterling Capital Management LLC	40	0.00%	$4K	-33 (-45.2%)
158	Blue Trust, Inc.	27	0.00%	$3K	—
159	Optiver Holding B.V.	23	0.00%	$2K	-77 (-77.0%)
160	North Star Investment Management Corp.	22	0.00%	$2K	—
161	Essential Partners LLC	16	0.00%	$2K	-1 (-5.9%)
162	Keating Financial Advisory Services, Inc.	14	0.00%	$1K	NEW
163	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13	0.00%	$1K	—
164	Trust Co	12	0.00%	$1K	—
165	EverSource Wealth Advisors, LLC	11	0.00%	$1K	+2 (+22.2%)
166	Quarry LP	11	0.00%	$1K	NEW
167	Global Retirement Partners, LLC	9	0.00%	$926	NEW
168	NATIONAL BANK OF CANADA /FI/	6	0.00%	$616	NEW
169	Transamerica Financial Advisors, LLC	3	0.00%	$308	—
170	Hughes Financial Services, LLC	3	0.00%	$309	+1 (+50.0%)
171	Clearstead Advisors, LLC	1	0.00%	$103	NEW

Exited since 2026-03-31 (19 filers; largest 19 shown)

AYAL Capital Advisors Ltd	−197,119
DG Capital Management, LLC	−168,217
ARDSLEY ADVISORY PARTNERS LP	−110,000
GRATIA CAPITAL, LLC	−87,500
Squarepoint Ops LLC	−59,736
Resolute Capital Asset Partners LLC	−51,106
Schonfeld Strategic Advisors LLC	−23,211
Apis Capital Advisors, LLC	−19,740
Virtu Financial LLC	−17,885
J. Goldman & Co LP	−9,033
ExodusPoint Capital Management, LP	−8,794
Brooklyn Investment Group	−5,284
Crewe Advisors LLC	−3,000
Destiny Wealth Partners, LLC	−775
CWM, LLC	−512
LOS ANGELES CAPITAL MANAGEMENT LLC	−141
Root Financial Partners, LLC	−47
MAI Capital Management	−20
Sunbelt Securities, Inc.	−3

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
BlackRock, Inc.	SCHEDULE 13G	2026-07-27	2026-06-30	999,278	5.1%
Jeffrey A. Altman	SCHEDULE 13D/A	2026-07-08	2026-06-25	5,551,684	28.5%
Owl Creek Asset Management, L.P.	SCHEDULE 13D/A	2026-07-08	2026-06-25	5,411,776	27.7%
T. Rowe Price Investment Management, Inc.	SCHEDULE 13G	2026-07-08	2026-06-30	2,348,019	12%
The Vanguard Group	SCHEDULE 13G/A	2026-01-30	2025-12-31	931,305	4.97%
DG Capital Management, LLC	SCHEDULE 13G/A	2025-11-12	2025-09-30	744,544	4%
Dov Gertzulin	SCHEDULE 13G/A	2025-11-12	2025-09-30	744,544	4%
Heard Capital LLC	SCHEDULE 13D/A	2025-03-05	2025-02-28	1,741,989	9.4%
Heard Investment Manager LLC	SCHEDULE 13D/A	2025-03-05	2025-02-28	1,741,989	9.4%
William E. Heard Declaration of Trust	SCHEDULE 13D/A	2025-03-05	2025-02-28	1,741,989	9.4%
William Heard	SCHEDULE 13D/A	2025-03-05	2025-02-28	1,741,989	9.4%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.